30
MODEL M75B
TYPE 2
DATA SHEET
STEREO DYNETIC®
PHONOGRAPH CARTRIDGE
SPECIFICATIONS
M75 TYPE 2 CARTRIDGE AND N75 TYPE 2 STYLUS SERIES
Model
Number
Diamond Stylus
Replacement
Output Volt-
age
(1,000 Hz. at
5 cm/sec)
Stylus
Grip
Color
Tracking
(Grams)
M75ED
TYPE 2
N75ED TYPE 2 (ED T2) Elliptical
Side Contact Radius: .0002" (.005 mm)
Frontal Radius: .0007" (.018 mm)
5.0 millivolts Black
¾ to 1½
M75G
TYPE 2
N75G TYPE 2 (G T2) Radius: .0006" (.015 mm)
5.0 millivolts
Dark
Gray
¾ to 1½
M75EJ
TYPE 2
N75EJ TYPE 2 (EJ T2) Elliptical
Side Contact Radius: .0004" (.010 mm)
Frontal Radius : .0007" (.018 mm)
5.0 millivolts
Light
Green
1½ to 3
M75B**
TYPE 2
N75-B TYPE 2*** (B T2) Radius: .0006" (.015
mm)
5.0 millivolts
Beige
1½ to 3
N75-3,* Radius: .0025" (.064 mm)
6.2 millivolts Green
1½ to 3
*The N75-3 stylus may be used to reproduce the standard
78 rpm records. In this case, the amplifier should be set to
"Monaural" or "A+B" mode.
**Formerly M75-6 TYPE 2.
***Formerly N75-6 TYPE 2.
TRACKABILITY
:
M75ED TYPE 2 at a stylus force of 1 gram. Stylus force:
400 Hz.
—
22 cm/sec.
1,000 Hz.
—
33 cm/sec.
10,000 Hz.
—
19 cm/sec.
M75G TYPE 2 at a stylus force of 1 gram.
400 Hz.
—
20 cm/sec
1,000 Hz.
—
28 cm/sec
10,000 Hz.
—
18 cm/sec
M75B** TYPE 2, and M75EJ TYPE 2 at a stylus force of 2
grams
400 Hz.
—
28 cm/sec
1,000 Hz.
—
35 cm/sec
10,000 Hz.
—
20 cm/sec
(Higher stylus forces within specified range improve
trackability.)
FREQUENCY RESPONSE
: From 20 to 20,000 Hz.
CHANNEL SEPARATION
: Nominally 25 db at 1,000 Hz.
INPUT IMPEDANCE
: Nominally 47,000 ohms (per channel).
Can be up to 70,000 ohms with almost inaudible change in
frequency response.
INPUT CAPACITANCE
: 400-500 picofarads per channel,
including tonearm wiring and amplifier input capacitance.
INDUCTANCE
: 720 millihenries
D.C. RESISTANCE
: 630 ohms
MOUNTING
: Standard ½" (12.7 mm) mounting center
WEIGHT
:
6
grams
TERMINALS
: 4 terminals
CONNECTIONS
: 4-Lead Stereo Connection: Connect "hot"
lead of right channel to terminal "R" (usually red) and shield
or ground lead of right channel to terminal "RG" (usually
green). Connect "hot" lead of left channel to terminal "L"
(usually white) and shield or ground lead of left channel to
"LG" (usually blue). To prevent "ground loops" and hum, no
common connection should be used at cartridge terminals.
CAUTION
: Do not make solder connections to cartridge
terminals. Make all solder connections to terminal jacks
provided before slipping them over the terminals.
MONAURAL OPERATION
: For monaural playback of rec-
ords, the left and right channels should be connected in
parallel. This is accomplished most conveniently by setting
the function switch on the associated amplifier to "A+B" or
"Mono."
SUGGESTIONS FOR CLEANING YOUR STYLUS
: To clean
the stylus, use a camel's-hair brush (No. 2 size or smaller)
dipped lightly in alcohol or alcohol-water solution; grain
alcohol is preferred. (WARNING: Commercial record or sty-
lus cleaning solutions may cause corrosion and permanent
stylus damage.) The alcohol will remove any sludge deposits
which may have coated the stylus tip. The brush bristles
should be trimmed to a length no longer than ¼ inch. AL-
WAYS brush the stylus with a forward movement from the
rear (terminal end of the cartridge) to the front. NEVER
brush or wipe the stylus from front to back or side to side.
RECORD CLEANING
: An effective way to clean a record is
to immerse it in a solution of mild dishwashing liquid deter-
gent and lukewarm or cool water (preferably distilled water).
Use a lint-free cloth to work the mixture into the grooves,
following the grooves around for a thorough cleansing. Then,
rinse with clear, cool or lukewarm water (preferably distilled)
and dry with a lint-free cloth.
EASY STYLUS REPLACEMENT
Grasp molded housing of stylus between thumb and fore-
finger. Gently withdraw stylus by pulling forward out of
cartridge. Grasp replacement stylus between thumb and
forefinger and insert into stylus socket. Press stylus into
socket until molded housing of the stylus mates with the
cartridge case. Care must be taken not to allow the finger to
slip off the molded housing of the stylus, resulting in dam-
age to the stylus tip or shank.
SPECIAL NOTE:
The Dynetic stylus assembly used in these
cartridges is the most critical component. To maintain the
original performance standards of your cartridge, be certain
that any replacement stylus you buy bears the following
certification on the package: "This Stereo Dynetic stylus is
precision manufactured by Shure Brothers Inc."
AVOID INFERIOR IMITATIONS. THEY WILL SERIOUSLY DE-
GRADE THE PERFORMANCE OF YOUR CARTRIDGE. ALL
GENUINE
“
DYNETIC
”
STYLI ARE MANUFACTURED BY SHURE
